Tool-shank.



f citizen' of the' United States, residin in the `city of Washington, District 'of OO umbia, have invented 'certain new anduseful Imexact description'of t ANDREWFSOIIULZROE WASHINGTONl DISTRICT on cO-LUMBIAyASSIeNOR '1 or ONE-,HALF :To-,JOHN c. P ENNIE, or WAS I+IINGfroN,l DISTRICT- OF Tool;-sI-muiuc.I

specineatien of Letters remit. 7

'.'1'0 all l'rl/hem' it may-concerne I' Be' it known that I, ANDREW ScHUrzIi, av

provements n Tool-Shanks 5 andI do hereby declare the folloivingll to be va full', cleanandeinvention, sch as will enable others skilled in thel art to which it ap- -.1o

pertains to make anduse the same.

i v.This invention relates to that' portion of a4 drill, bit, screw-driver, or-other tool by which the tool 1s secured in operative position, which "portion is x5 generally known as the shan of-thetool. f

The chucks of lathes, the s indles of drillv1 'es ses,; and other tool-hol ing means are uilt indifferent forms, and each'form rel uir'es acorrespondingshape of tool-shankto t it, 'It is the yobject of the present invention to provide means whereby a tool may be secured 1n any one of a number of tool-holdersof dif'- ferent forms.

,It is contemplated that lthe invention will find' its widest use in c onnectionwithbits or lholders which are respectively adapted-to tadrills'and'it is-therefoi'e illustratedin a device `of that character`4w It is' the practice among'machiniststo so construct -the holdingin'eans for drills or bits asy toV ada t them to receive either a tapered Or a cy indrical shank, and it has heretofore been the practice to provide a tool with a tapered shank for'- use in'one machine and atool with acyllndrical shank for use inthe other.

In the accompanyingdrawingsis shown aV kd rill providedwith means for securing it in f pering and cylindrical Shanks.

a drill having a shank embodyin the invention secured In a chuckwhich is s Own in sec-v tion, thechuck being adapted to. receive a cylindrical shank.l Fig. 21s. a side view of the drill, artlybroken away, secured in a drilli shank, the/spindle and ings, the

rimmed June 19, i906.

shownin section.`

Referrin to Figs. 1',`2,fand"3 offthedrawcy indrical, and the tapering surfaces B andl D erated vby astraight line. The manner'of v securing the drill in Fig. 1 is evident from the drawings, as is also that in relation to the device shown in Fi .'2. f

rillcomprises' the' usual twisted portion A and the shank having the holder-' len agingsurfaces BC D. .The surface C lsi" adapting means being v 55 f Referring to FIg. 4, the shank prof er of they drill-is shown as being of the or'` inary tapered kind and is secl'iredwithinv the drills indle through the instrumentality of a s eeve E, upon lthe outside of which is provided'a-.plurality of holder-engaging surfaces F, G, and H, `similar tothe surfaces B, C, and D upon the shank'proper of the tool shown vin Figs. 1,2,.and 3.) This sleeve provides a means forv adaptiny the shank proper 4of the tool to eitheracy indrical or tapered openlng in a holding means, and it will be Ob- `served that by this arrangement a tool-shank may be adapted to be used inv a holder different from that tol which it was primarily inu tendedto be applied. The sleeve E on being secured to the shank; proper of the tool becomes, in effect,.a part thereof, and the tool, with its attached Sleeve, may be manipulated in precisely the 'same manner as if the' sleeve were an integral part of the shank. The sleeve, together with the shank pro er, in the practical operationl of the tool orms the l vshank ofthe tool. l

So far as I am aware, the two outer taper#- non-tapering surface, are features which are ing surfaces, together with the intermedlate Of the drawings, Figure 1 is a side view of broadly new, whether applied to a shankrigid with the tool or to a sleeve separable from the shankjproperf. j It will therefore be understood that in claims 1, 2, and 3 the words means for engaging holder-sockets oi' different forms are-'used generically to designate both the modlficatlon shown 1n Fig. 4 and that shownm the remaining iig;-I

ures. Claim 4 :is specific-to the removable sleeve having thesurfaces referred to,

. While the invention has been illustrated in what is considered its most useful'embodiment, various structures-may be'A employed Without departing froniithe spirit oftheinvention, 'and it should not, therefore, be llmited to thc structurcshown.

persections of sulistnntially'equal inclination,

and an intermediate section the surfice of which is substnnti'zilly parallel to the axis of the holder-socket.

2. Atoolhuvingnwnnsforengnginghohlor-` sockete ofditlercnt fornis, including two tn- )cr surfaces lying in the saine surface of revolution, and an intermediate cylindrical surface.

3 Q A tool havingmeans for engagingholdersockets of different forms, including two surfaces tapering at the saine angle, and an intermediate cylindrical surface.

4. Means for engaging a tool with holdersockets of different formsJ said means consisting of :t separable sleeve forming n rigid part ofthe tool when in use and including two taperingsurfuces, and :in intermediate non-tapering surface. Y

In testimony whereof I :iHix my signature in present-c of two witnesses.

ANDREW SCHULZE.

iitncsset J. E, HU'rcnrNsox, Jr., GEO. W. REA. 

